From January 1990 through August 2004, CPSC has reports of two incidents of evisceration/disembowelment. CPSC is not aware of any associated deaths, but the injuries are irreversible and have a devastating effect on the victim's future health and development (Ref. 1). These cases, in addition to cases prior to 1990, include incidents of young children sitting on and being ”sucked into” drain sumps with missing covers, and suffering rectal lacerations and partial and nearly complete eviscerations.
The scenario leading to disembowelment typically involves a young child, 2 to 6 years old, who sits on an uncovered drain. The incidents occur primarily in public wading pools where a floor drain cover is broken or missing. Young children have direct access to the bottom drain in wading pools because of the shallow water. Generally, drains are equipped with either flat grates or dome-shaped covers. The domed shape helps to prevent sealing of the pipe opening by the body. However, if the grate or cover is unfastened, broken, or missing, the potential for an incident exists. When the child's buttocks cover the drain opening, the resulting suction force can eviscerate the child through the ruptured rectum. A small change in pressure is sufficient to cause such injury extremely quickly (Ref. 2).
"Guidelines for Entrapment Hazards" - http://www.cpsc.gov/CPSCPUB/PUBS/363.pdf
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